FC451 Procedure
Uploaded by
Michael BogdanFC451 Procedure
Uploaded by
Michael BogdanPage 1 of 12
FAULT CODE
Associated Procedures
Troubleshooting Steps
STEPS SPECIFICATIONS
STEP 1. Check the fault codes.
STEP 1A. Check for sensor Fault Code 227 active?
supply fault codes.
STEP 1B. Check for an inactive Fault Code 451 inactive?
fault code.
STEP 2. Check the rail fuel pressure
sensor and circuit.
STEP 2A. Inspect the rail fuel Dirty or damaged pins?
pressure sensor and connector
pins.
STEP 2B. Check the circuit Fault Code 452 active and Fault Code
response. 451 inactive?
STEP 2C. Check the sensor 4.75 to 5.25-VDC?
supply voltage and return circuit.
STEP 2D. Check the fault codes Fault Code 451 active?
and verify sensor condition.
STEP 3. Check the engine control module
and engine harness.
STEP 3A. Inspect the engine Dirty or damaged pins?
control module and engine
harness connector pins.
STEP 3A-1. Check the engine
control module response.
STEP 3A-2. Check for an inactive
fault code.
STEP 3B. Inspect the engine Dirty or damaged pins?
control module and engine
harness connector pins.
STEP 3B-1. Check the sensor
supply voltage and return circuit.
STEP 3B-2. Check for an inactive
fault code.
STEP 4. Clear the fault code.
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STEP 4A. Disable the fault code. Fault Code 451 inactive?
STEP 4B. Clear the inactive fault All fault codes cleared?
codes.
Guided Step 1 - Check the fault codes.
Guided Step 1A - Check for sensor supply fault codes.
Conditions
z Turn keyswitch ON.
z Connect INSITE™ electronic service
tool.
Action
Check for sensor supply fault codes.
z Use INSITE™ electronic service to
read the fault codes.
Fault Code 227 active? Fault Code 227 active?
YES NO
No Repair No Repair
Appropriate troubleshooting tree Go to 1B
Guided Step 1B - Check for an inactive fault code.
Conditions
z Turn keyswitch ON.
z Connect INSITE™ electronic service
tool.
Action
Check for an inactive fault code.
z Use INSITE™ electronic service tool
to read the fault codes.
Fault Code 451 inactive? Fault Code 451 inactive?
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YES NO
No Repair No Repair
Inactive or Intermittent Fault Code, Refer
Go to 2A
to Procedure 019-362
Guided Step 2 - Check the rail fuel pressure sensor and
circuit.
Guided Step 2A - Inspect the rail fuel pressure sensor and connector pins.
Conditions
z Turn keyswitch OFF.
z Disconnect the rail fuel pressure
sensor from the engine harness.
Action
Inspect the engine harness and rail fuel
pressure sensor connector pins for the
following:
z Loose connector
z Corroded pins
z Bent or broken pins
z Pushed back or expanded pins
z Moisture in or on the connector
z Missing or damaged connector seals
z Dirt or debris on or in the connector
pins
z Connector shell broken
z Wire insulation damage
z Damaged connector locking tab.
Use the following procedure for general
inspection techniques. Refer to Procedure
019-361 in Section 19.
Dirty or damaged pins? Dirty or damaged pins?
YES NO
A damaged connection has been detected
in the sensor or harness connector. No Repair
Clean the connector and pins.
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Repair the damaged harness, connector, or
pins if possible.
Refer to Procedure 019-043 in Section 19.
Go to 4A Go to 2B
Guided Step 2B - Check the circuit response.
Conditions
z Turn keyswitch OFF.
z Disconnect the rail fuel
pressure sensor from the
engine harness.
z Turn keyswitch ON.
z Connect INSITE™ electronic
service tool.
Action
SMALL | MEDIUM | LARGE
Place a jumper wire between the rail
fuel pressure RETURN pin and the
rail fuel pressure SIGNAL pin at the
rail fuel pressure sensor connector
of the engine harness.
Check for the appropriate circuit
response after 30 seconds.
z Use INSITE™ electronic
service tool to read the fault
codes.
Refer to the wiring diagram for
connector pin identification.
Fault Code 452 active and Fault Code Fault Code 452 active and Fault Code 451
451 inactive? inactive?
YES NO
No Repair No Repair
Go to 2C Go to 3A
Guided Step 2C - Check the sensor supply voltage and return circuit.
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Conditions
z Turn keyswitch
OFF.
z Disconnect the
rail fuel pressure
sensor from the
engine harness.
z Turn keyswitch
ON.
Action
Check the supply
voltage and return SMALL | MEDIUM | LARGE
circuit.
z Measure the
voltage from the
rail fuel pressure
+5 volt SUPPLY
pin to the rail
fuel pressure
RETURN pin at
the sensor
connector of the
engine harness.
Refer to the wiring
diagram for connector
pin identification.
4.75 to 5.25-VDC? 4.75 to 5.25-VDC?
YES NO
No Repair No Repair
Go to 2D Go to 3B
Guided Step 2D - Check the fault codes and verify sensor condition.
Conditions
z Turn keyswitch OFF.
z Connect the rail fuel pressure sensor
to the engine harness.
z Turn keyswitch ON.
z Connect INSITE™ electronic service
tool.
Action
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Check for the appropriate circuit response
after 30 seconds.
z Use INSITE™ electronic service tool
to read the fault codes.
Fault Code 451 is active? Fault Code 451 is active?
YES NO
A damaged sensor has been detected.
None. The removal and installation of the
Replace the rail fuel pressure sensor.
connector corrected the fault.
Refer to Procedure 019-115 in Section 19.
Go to 4A Go to 4A
Guided Step 3 - Check the engine control module and
engine harness.
Guided Step 3A - Inspect the engine control module and engine harness
connector pins.
Conditions
z Turn keyswitch OFF.
z Disconnect the engine harness from
the ECM.
Action
Inspect the engine harness and engine
control module engine connector pins for
the following:
z Loose connector
z Corroded pins
z Bent or broken pins
z Pushed back or expanded pins
z Moisture in or on the connector
z Missing or damaged connector seals
z Dirt or debris on or in the connector
pins
z Connector shell broken
z Wire insulation damage
z Damaged connector locking tab.
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Use the following procedure for general
inspection techniques. Refer to Procedure
019-361 in Section 19.
Dirty or damaged pins? Dirty or damaged pins?
YES NO
A damaged connection has been detected
in the engine control module engine
connector or engine harness connector.
Clean the connector and pins.
No Repair
Repair the damaged harness, connector or
pins if possible.
Refer to Procedure 019-043 in Section 19.
Go to 4A Go to 3A-1
Guided Step 3A-1 - Check the engine control module response.
Conditions
z Turn keyswitch
OFF.
z Disconnect the
engine harness
from the ECM.
z Turn keyswitch
ON.
z Connect
INSITE™
electronic
service tool.
SMALL | MEDIUM | LARGE
Action
Place a jumper wire
between the rail fuel
pressure +5 volt
SUPPLY pin and the
rail fuel pressure
SIGNAL pin at the
ECM engine
connector.
Check for the
appropriate circuit
response after 30
seconds.
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z Use INSITE™
electronic
service tool to
read the fault
codes.
Refer to the wiring
diagram for connector
pin identification.
Fault Code 452 active Fault Code 452 active and Fault Code 451 inactive?
and Fault Code 451
inactive?
YES NO
Call for authorization to replace the ECM.
No Repair Upon receipt of authorization, replace the ECM.
Refer to Procedure 019-031 in Section 19.
Go to 3A-2 Go to 4A
Guided Step 3A-2 - Check for an inactive fault code.
Conditions
z Connect all components.
z Turn keyswitch ON.
z Connect INSITE™ electronic service
tool.
Action
Check for the appropriate circuit response
after 30 seconds.
z Use INSITE™ electronic service tool
to read the fault codes.
Fault Code 451 inactive? Fault Code 451 inactive?
YES NO
A pin to pin short circuit has been detected
on the signal line of the engine harness.
None. The removal and installation of the
connector corrected the fault. Repair or replace the engine harness.
Refer to Procedure 019-043 in Section 19.
Go to 4A Go to 4A
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Guided Step 3B - Inspect the engine control module and engine harness
connector pins.
Conditions
z Turn keyswitch OFF.
z Disconnect the engine harness from
the ECM.
Action
Inspect the engine harness and engine
control module engine connector pins for
the following:
z Loose connector
z Corroded pins
z Bent or broken pins
z Pushed back or expanded pins
z Moisture in or on the connector
z Missing or damaged connector seals
z Dirt or debris on or in the connector
pins
z Connector shell broken
z Wire insulation damage
z Damaged connector locking tab.
Use the following procedure for general
inspection techniques. Refer to Procedure
019-361 in Section 19.
Dirty or damaged pins? Dirty or damaged pins?
YES NO
A damaged connection has been detected
in the engine control module engine
connector or engine harness connector.
Clean the connector and pins.
No Repair
Repair the damaged harness, connector or
pins if possible.
Refer to Procedure 019-043 in Section 19.
Go to 4A Go to 3B-1
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Guided Step 3B-1 - Check the sensor supply voltage and return circuit.
Conditions
z Turn keyswitch
OFF.
z Disconnect the
engine harness
from the ECM
connector.
z Turn keyswitch
ON.
Action
Check the supply
voltage and return SMALL | MEDIUM | LARGE
circuit.
z Measure the
voltage from the
rail fuel pressure
+5 volt SUPPLY
pin to the rail fuel
pressure
RETURN pin at
the ECM engine
harness
connector.
Refer to the wiring
diagram for connector
pin identification.
4.75 to 5.25-VDC? 4.75 to 5.25-VDC?
YES NO
Call for authorization to replace the ECM.
No Repair Upon receipt of authorization, replace the ECM.
Refer to Procedure 019-031 in Section 19.
Go to 3B-2 Go to 4A
Guided Step 3B-2 - Check for an inactive fault code.
Conditions
z Connect all components.
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z Turn keyswitch ON.
z Connect INSITE™ electronic service
tool.
Action
Check for the appropriate circuit response
after 30 seconds.
z Use INSITE™ electronic service tool
to read the fault codes.
Fault Code 451 inactive? Fault Code 451 inactive?
YES NO
An open RETURN circuit has been detected
in the engine harness.
None. The removal and installation of the
connector corrected the fault. Repair or replace the engine harness.
Refer to Procedure 019-043 in Section 19.
Go to 4A Go to 4A
Guided Step 4 - Clear the fault codes.
Guided Step 4A - Disable the fault code.
Conditions
z Connect all components.
z Turn keyswitch ON.
z Connect INSITE™ electronic service
tool.
Action
Disable the fault code.
z Start the engine and let it idle for 1
minute.
z Use INSITE™ electronic service tool
to verify that the fault code is
inactive.
Fault Code 451 inactive? Fault Code 451 inactive?
YES NO
No Repair No Repair
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Go to 4B Go to 1A
Guided Step 4B - Clear the inactive fault codes.
Conditions
zConnect all components.
z Turn keyswitch ON.
z Connect INSITE™ electronic service
tool.
Action
Clear the inactive fault codes.
z Use INSITE™ electronic service tool
to clear the inactive fault codes.
All fault codes cleared? All fault codes cleared?
YES NO
No Repair No Repair
Repair complete Appropriate troubleshooting steps